18mm Doering Spark Plug Set
SKU
36-11
18mm Doering Spark Plug Set
Large hex original design for air cooled engines, #3 heat range terminal nuts and seal washers included.
Includes top ventilated brass collars for cooling, as original, Doering design! Terminal nut is not removable. Plug set has a round feeler gauge. Spark plugs have a 18mm thread and the large hex measures 1-3/8", which is perfect for early restoration and riding. Set is for use with 1924 Harley models that require 7/8" thread spark plug. *NOTE: Sold as a pair.